mirror of https://github.com/acidanthera/audk.git
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/** @file
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* Exception Handling support specific for AArch64
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*
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* Copyright (c) 2016 HP Development Company, L.P.
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*
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* This program and the accompanying materials
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* are licensed and made available under the terms and conditions of the BSD License
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* which accompanies this distribution. The full text of the license may be found at
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* http://opensource.org/licenses/bsd-license.php
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*
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* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*
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**/
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#include <Uefi.h>
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#include <Chipset/AArch64.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Protocol/DebugSupport.h> // for MAX_AARCH64_EXCEPTION
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UINTN gMaxExceptionNumber = MAX_AARCH64_EXCEPTION;
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EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };
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EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };
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PHYSICAL_ADDRESS gExceptionVectorAlignmentMask = ARM_VECTOR_TABLE_ALIGNMENT;
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UINTN gDebuggerNoHandlerValue = 0; // todo: define for AArch64
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#define EL0_STACK_PAGES 2
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VOID
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RegisterEl0Stack (
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IN VOID *Stack
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);
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RETURN_STATUS ArchVectorConfig(
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IN UINTN VectorBaseAddress
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)
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{
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UINTN HcrReg;
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UINT8 *Stack;
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Stack = AllocatePages (EL0_STACK_PAGES);
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if (Stack == NULL) {
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return RETURN_OUT_OF_RESOURCES;
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}
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RegisterEl0Stack ((UINT8 *)Stack + EFI_PAGES_TO_SIZE (EL0_STACK_PAGES));
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if (ArmReadCurrentEL() == AARCH64_EL2) {
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HcrReg = ArmReadHcr();
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// Trap General Exceptions. All exceptions that would be routed to EL1 are routed to EL2
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HcrReg |= ARM_HCR_TGE;
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ArmWriteHcr(HcrReg);
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}
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return RETURN_SUCCESS;
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}
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